FA与FNA对A/O工艺短程硝化处理垃圾渗滤液的影响

摘要

According to the special water quality characteristics of landfill leachate,the effect of free ammonia (FA) and free nitrous acid(FNA) on the short-cut nitrification of landfill leachate in an A/O system has been studied. Subsequently, the short-cut nitrification can be achieved and maintain steady when the initial ammonia-nitrogen concentration is up to 300 mg/L,the nitrite accumulation rate reaches 60.79% and continues to grow higher along with the increase of initial ammonia-nitrogen concentration. The ammonia-nitrogen removing efficiency always keeps at above 80%. The initial concentration of ammonia-nitrogen has an enormous influence on the type of nitration of the system. The alternative inhibition of FA and FNA is the key factor to start-up and maintain the process of shortcut nitrification steady.%针对垃圾渗滤液的特殊水质特点,研究了游离氨(FA)与游离亚硝酸(FNA)对A/O工艺短程硝化反硝化处理垃圾渗滤液脱氮效果的影响.试验结果表明,当初始氨氮平均增大到300 mg/L时,系统可实现稳定的短程硝化反硝化,亚硝态氮积累率达到60.79％,并随着初始氨氮浓度的增加进一步提高,系统对氨氮的去除率始终维持在80％以上.初始氨氮浓度对系统硝化类型有极大影响,FA与FNA的交替抑制作用是系统启动并维持稳定短程硝化过程的关键.